Signal processing for a lidar system
| dc.contributor.author | Sasmal, Debasish | en_US |
| dc.date.accessioned | 2024-08-15T18:19:08Z | |
| dc.date.available | 2024-08-15T18:19:08Z | |
| dc.date.copyright | 2001 | en_US |
| dc.date.issued | 2001 | |
| dc.degree.department | Department of Electrical and Computer Engineering | |
| dc.degree.level | Master of Applied Science M.A.Sc. | en |
| dc.description.abstract | The advent of LIDAR technology has led to a range of applications in the field of topographical mapping. An airborne laser system can acquire a large volume of terrain data within a short span of time. The thesis is based on a project which involves the development of ground and canopy profiles from a terrain data acquired by a laser system mounted on an airborne sensor platform. The project, sponsored by Terra Remote Sensing Inc., also involves extracting wire hits, if any, from the terrain data and drawing catenary curves through the wire hits. While data acquired by a profiler laser system are good for extracting a 2-D topographical curve they are not suitable for obtaining a 3-D surface plot. Data acquired by a laser scanner system, on the other hand, are quite suitable for obtaining a 3-D terrain model. The process starts by classifying the data points as ground hits, canopy hits or wire hits using a method based on order statistics filters. The non-uniformly located data points are interpolated in order to obtain smooth profiles. Two methods of interpolating non-uniform profiler data have been used. The first is a multiscale process wherein the data are regularized using an iterative piecewise polynomial method. The second method is based on maximum smoothness interpolation in the wavelet domain. The wavelet based interpolation technique has also been used to interpolate data acquired by a scanner system. A second method used for interpolating scanning data involves fitting a smooth curve in each of the triangular cells formed by drawing a triangulated network with data points as vertices of the network. Finally, catenary wires have been traced by joining the wire hits and eliminating data points which might have wrongly been classified as wire hits. | |
| dc.format.extent | 83 pages | |
| dc.identifier.uri | https://hdl.handle.net/1828/19575 | |
| dc.rights | Available to the World Wide Web | en_US |
| dc.title | Signal processing for a lidar system | en_US |
| dc.type | Thesis | en_US |
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